BELLVUE -- Larimer County Commissioner Steve Johnson spent the night on the floor of his office in Fort Collins after the 36,930-acre High Park fire forced him from his Horsetooth area home Sunday.

"I wish I had a webcam trained on my home," said the elected official.

Johnson is one of hundreds evacuated by the largest fire on record in Northern Colorado -- many of whom expressed frustration Monday about waiting for information on the fate of their homes.

Sheriff Justin Smith confirmed that at least 100 structures have burned in Rist Canyon among others in the Poudre Canyon. He offered general areas, but said the active fire, smoke and efforts to save houses still standing have prevented his staff and firefighters from confirming addresses of the burned homes, garages, cabins and outbuildings.

Officials met with hundreds of residents at an evacuation center at The Ranch, but the limited information they could offer frustrated some.

Evacuated resident Lou DeAngelis was particularly dissatisfied and said he believes, with technology, officials should have addresses confirmed by now.

"We just want to know about our lives," DeAngelis said. "We can find people in caves in Afghanistan, yet we can't tell you about a house in Rist Canyon."

"It's extremely difficult to know what to do. We're trying to make decisions," he said. "They're just not giving us the answers, and it makes me sad. It's sad enough watching the forest burn and animals run and people's horses."

Nick Christensen, executive officer with the Larimer County Sheriff's Office, said he understands people's frustration, but the information and answers are coming as quickly as possible.

The fire burned homes near Stratton Park, Whale Rock, Davis Ranch Road, Soldier Canyon Estates, Mill Canyon and Missile Silo Road. Others in the same area remain untouched by the fickle flames that, at times, raced across the landscape at a mile per hour.

By late afternoon Monday, officials estimated the fire had burned 36,930 acres and was still zero percent contained. A Type 1 incident command team had taken over fire operations, making it one of the top priority fires burning in the country. The tally was 400 firefighters, five single engine air tankers, five heavy air tankers and at least six helicopters dropping water and fire retardant.

At least 200 more firefighters are expected to join the effort over the next two days.

Lightning sparked the fire, which was reported Saturday morning as 2 acres in size and quickly grew due to a mixture of hot, windy, dry weather and rugged, parched terrain.

"We're dealing with a very dynamic environment where we're mixing low fuel moisture, this fuel, terrain and the changing weather patterns and mixing in the homes scattered throughout," said Bill Hahnenberg, incident commander.

Crews made progress on the fire Monday, but officials do not know how much it grew. Updated figures are expected Tuesday morning as crews continue the battle and residents continue their wait.

Johnson said he understands the challenges facing crews and the frustration facing residents.

"You have a sick feeling in your stomach," he said. "You feel helpless. You don't have any clue what's going on."